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Engine Compression

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Warm engine to normal operating temperature. Remove all spark plugs. Disconnect ignition coil primary wire connector. Hold throttle plate fully open. Crank engine and note compression pressure.

COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm2 ) @ RPM Standard psi (kg/cm2 ) @ RPM
B2300 B3000 & B4000 (1) (1)
Mazda6
2.3L (2) 139 (9.8) @ 285 199 (14.0) @ 285
3.0L (1) (1)
Miata (2) 146 (10.3) @ 300 198 (13.9) @ 300
MPV (1) (1)
Protege & Protege5 (2) 119 (8.4) @ 300 171 (12.0) @ 300
Tribute
2.0L & 3.0L (1) (1)
(1) Lowest compression reading should not be less than 75 percent of highest compression reading.
(2) Difference between cylinders should not be more than 28 psi (2.0 kg/cm2 ).
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